scope:

This standard pertains to types of joint preparation for metal-arc welding with covered electrode, gas-shielded metal-arc welding and gas welding on steel. It applies to joint preparation for fully-penetrated butt welds, except in the caseof some recommended types of joint preparation (reference numbers 3.10A, 3.10B and 4.10C); if a butt weld is not possible or necessary, special arrangements need to be made. For not-fully-penetrated butt welds, types of joint preparation and dimensions differing from those specified in this standard mau be stipulated. The root gaps referred to in this standard are those gaps presented after tack welding, if used. Consideration should be given to altering the joint preparation details (where appropriate) to facilitate temporary backing, "one-site welding", etc.